Goal

There should be a way to run a single test or tests that match a pattern, or whatever is supported by python modules that do test discovery in the project.
E.g. this should work as expected:

$ ./manage.py test -k test_pay_for_failed_order
Creating test database for alias 'default'...
System check identified no issues (0 silenced).
.
----------------------------------------------------------------------
Ran 1 test in 2.289s

OK
Destroying test database for alias 'default'...

What it does

• Moves example project settings used in tests into the obvious looper_example_project;
• Moves test modules into the application they are testing, namely looper (this also happens to match DevFund's looper structure);
• Updates mypy to make it fail on slightly fewer false-positives.

Branch move-tests